Brake-valve.



1MM. ROBINSON.

BRAKE VALVE.

APPLICATION PILEDSBPT. 14, 1909.

DAVID M. ROINSON, OF ALLEGHENY, PENNSYLVANIA- BRAKE-VALVE.

Application medjsepteaiberia,1909. serial No. 517,646.

To a-ZZ whom 'it 'ma/y concern.'

Be it known that I, DAvIn'MflomSson, a citizen 01 the United States, vresiding at. Allegheny, in the county l State of Pennsylvanizu have invented Incw and nseful'- Improvements in Bi'alie-,Vz-ilvevs, of which the following' is a specification. i

The present invention provides a valve of novel and peculiar` lformation to be located in the train pipe of automatic air brake systems to admit of setting the brakes automatic'ally in an emergency, said valve being' adapted to be cont-rolled independently of the engineerl or other train operator so as to apply the brakes and bringthe train to a standstill. v

The invention provides a' valve which when closed provides a passage for the escape ot the air from the brake cylinder and which when open admits air under pressure'to the brake cylinder, so as to overcome'the force normally7 exerted to sct the brakes and hold t said brakes out of action.

Il O

The invention consists of the novel ifeau tuus, details of construction and"cor'nbma tion of parts, which hereinafter Will be more parlieularlv set forth, illustrated in the accompanying drawing. and pointed outvin the appended claim. A

lieti-winglo the drawing. forming a part ol" the speeitication, the same is a vertical reni ral lfaigitudinal section of' a brake valve embmlring the invention.

The val ve comprises two sections A and B, which are preferably connected in a manner to admit of their separation. The section B consists of afvalve casing having an inner partition formed with an opening, which is adapted to bei closed by means of a valve 1 mounted to reciprocate. The valve casing is interposed in the lengt-h of the train pipe, the endQ having connection with the pipe leading from the engineers valve and the end 3 having connection with the pipe leading to the brake cylinder. The valve 1 is carried by a stein It arranged to reciprocate in the section A and to close downward upon the seat surrouruling the opening in the partition of the valve casing.

The section A. consists of a cylinder 5 and coupling end G, the latterfbeing reduced and having a central opening in which the stein 4 is mounted to reciprocate. The opening through the coupling end (iis enlarged at 7 and further enlarged at'S, ing formed at thelend of the enlarged pori tion orat the juncture 8. vThe valve'stem has its lower portion of Allegheny and, v,being beveled to Acloses on 12 having a centrally disposed loess fornied upper end of the, steni 4, is* arranged tooperportion of lower end of the spring,

a. valve seat 9 lie-- 4 Specification of Letters Patent. Patented 3,11;I v10,` `1911,

o f the parts? and' enlargedat 10, the end of tl'ie'enlargem'ent form a valve 11', 'which the seat* 9., 4v-Vhen'the valve 1 is open the-valve 11 is closed and vice versa'.- The cylinder 5 is closed by means cfa cap eonnecwith an opening to receive a pipeor tion leading from a source fof supply A piston 13,. secured or the like.

ate in the cylinder 5. A helicalsr n 'gjd of the expansible type is'located i'n'the l'lower the cylinder 5 and surrounds the is connedvbetween the piston 13 and the lower end of tlie'cylinder, .said lower endbeing recessed to 'forma seatfor the.

Wherebythe latter is centered and'retained inoperative position. An opening 15 leads outward from the space 7 through a slide of the coupling .end 6 and constitutes a dischargeor vent for: the air or other medium from the brake cylinder.

In the practical operation ofthe inven-. tion the valve is located at any convenient point in the stem 4 and length ol' the train pipe andis normally held open by means of the spring 14, lwhich presses the piston 13 upward, thereby admittingair or other motive medium to pass to the brakceylinder to hold the brakes out of action. The upper .portion of the Cylinder 5 is connected With means for supplying air, steam, or like medium for operatingv the' piston 13,. and whichA means are adapted to be controlled in any manner by electrical .devices or otherwise, so that at a critical moment air or like motive medium is admitted into the`npper portion of the cylinder 5 and exerts a downward pressure on the piston 13 to overcome the force of the spring 14e and press the valve 1 downward upon its seat, thereby shutting o air or motive medium to the brake cylinder and at thesame time unseating the Valve 11, whereby the air or other motive. medium from the brake cylinder may escape backward through the train pipe and out through the spaces 8 and 7 and the discharge opening 15 4with the result that the brakes are automatically set. Upon relieving the piston 13 of the pressure exerted downward thereon, the spring 14 moves said piston upward. and seats the valve 11 and unseats the valve l, thereby permitting motive medium to pass through the train pipe to the brake cylinder and release the brakes.

From the foregoing description, taken in connection with the accompanying -drawings, the advantages of the construction and of the method of operation will be readily apparent to those skilled in the art to which the invention appertains, and While I have described the principle of operation of the i ing two sections adapted to vbe detachably connected, one lof the sections consisting of .a valve casing, the other section comprising' a cylinder anda coupling end, a cap closing the open end of the cylinder and said coupling end having an opening therethrough which is enlarged to form stepped portions, and having a lateral discharge opening leadving from the smaller enlargement of said opening, Ia valve for closing the opening through the valve casing, a stem connected with said valve and operating through the opening of the coupling end and having its lower end enlarged and terminating x11n a valve which closes upon a seat formed between the stepped portions of the enlarged opening of the coupling end, ra piston arranged to' operate 'in the cylinder and attached to said stem, and a spring surrounding the stem and exerting an upward pressure upon the piston to normally hold the main valve open and the .second valve seated.

In testimony whereof I ax my signature in presence of two witnesses.

. DAVID M. ROBINSON. Witnesses:

V. B. I-IILLYARD, J onN L. FLETCHER. 

